looking for work and filling out job applications

I have started filling out job applications, writing letters of application, resume, personal statement... and I am sure it is a busy time for all of us looking for a job.
I have used one web site that has helped me to build my documents : http://resumes-for-teachers.com/
But still it is hard for a new teacher to know what to put in those documents in order to make it a successful application.
How, as a newly qualified teacher, can I work on my applications so that my resume is not taken out from the list because of my lack of experience?
What are the challenges you face when looking for a job or filling out applications?